因为它们可造成施放地区长时间染毒，人员不宜立即进入该地区，所以 称这类毒剂为持久性毒剂（persistent agents）。微粉状毒剂施放后沉落于地面，人员或 车辆通过或风速较大时再度飞杨，故可造成较长时期的地面和空气染毒。
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Nausea was the most commonly reported adverse event with both agents, with slightly less persistent nausea in the liraglutide group than in the exenatide group.
两种药使用中报告频率最多的不良反应是呕吐，依拉鲁肽组相比依克那肽组持续呕吐的发生要稍轻些。
To design a new drug vector for promoting the agents across cellular membrane and releasing at the target issues is a persistent challenge.
构建一种药物载体使其能顺利穿透细胞膜并在靶向部位释放，已成为药物设计中亟需解决的问题之一。
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